June 2005
Intermediate to advanced
794 pages
18h 27m
German
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3.8 Ein Datum validieren
Problem
Sie möchten die Gültigkeit eines Datums überprüfen. Zum Beispiel möchten Sie sicherstellen, dass ein Benutzer kein Geburtsdatum wie den 30. Februar 1962 angeben kann.
Lösung
Verwenden Sie checkdate( ):
$valid = checkdate($monat,$tag,$jahr);
Diskussion
Die Funktion checkdate( ) gibt true zurück, wenn $monat zwischen 1 und 12 liegt, $jahr zwischen 1 und 32767 sowie $tag zwischen 1 und der korrekten Maximalzahl der Tage für $monat und $jahr. Schaltjahre werden von checkdate( ) korrekt behandelt und dem Gregorianischen Kalender entsprechend interpretiert.
Da checkdate( ) einen derart weiten Bereich für gültige Jahre hat, sollten Sie die Benutzereingaben zusätzlich überprüfen, wenn Sie beispielsweise ein gültiges Geburtsdatum ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.